Re-named the message component

Denys Mishunovrequested to merge
dmishunov/basic-message-refactoring into main

We should stick to the GitLab Duo Chat name and not pull in the AiGenie* patterns from the WebUI - those will be re-named soon anyway.

Neither visual, nor functional changes are introduced:

Screenshot_2023-08-04_at_10.04.19

References #899 (closed)

Edited by Denys Mishunov

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